How long one gallon of Essiac tea lasts depends, of
course, on how much one drinks every day. For example, if a person just
drank the minimum dosage of one ounce per day, one gallon (128 oz.) would
theoretically last about four months. However, the tea would spoil in the
refrigerator before two months are up. It is therefore better to make the
tea in 1/2 gallon batches which should last about one month or use canning
methods to sterilize the jars to extend the shelf life outside the refrigerator.

Some people choose to drink more than one serving
of Essiac tea every day. So, for example, if someone drank three 2 oz. servings
(3/4 cup or 6 oz.) every day, one gallon would last about three weeks.
That dosage, however, is more than Rene Caisse recommended.